arm: mach-k3: am62: Fixup thermal zone critical points

Read the max temperature for the SoC temperature grade from the hardware
and change the critical trip nodes on each thermal zone of FDT at
runtime so they are correct with the hardware value for its grade.

Signed-off-by: Joao Paulo Goncalves <joao.goncalves@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/arch/arm/mach-k3/am625_fdt.c b/arch/arm/mach-k3/am625_fdt.c
index 970dd34..3c46d10 100644
--- a/arch/arm/mach-k3/am625_fdt.c
+++ b/arch/arm/mach-k3/am625_fdt.c
@@ -38,11 +38,48 @@ static void fdt_fixup_pru_node_am625(void *blob, int has_pru)
 		fdt_del_node_path(blob, "/bus@f0000/pruss@30040000");
 }
 
+static int fdt_fixup_trips_node(void *blob, int zoneoffset, int maxc)
+{
+	int node, trip;
+
+	node = fdt_subnode_offset(blob, zoneoffset, "trips");
+	if (node < 0)
+		return -1;
+
+	fdt_for_each_subnode(trip, blob, node) {
+		const char *type = fdt_getprop(blob, trip, "type", NULL);
+
+		if (!type || (strncmp(type, "critical", 8) != 0))
+			continue;
+
+		if (fdt_setprop_u32(blob, trip, "temperature", 1000 * maxc) < 0)
+			return -1;
+	}
+
+	return 0;
+}
+
+static void fdt_fixup_thermal_zone_nodes_am625(void *blob, int maxc)
+{
+	int node, zone;
+
+	node = fdt_path_offset(blob, "/thermal-zones");
+	if (node < 0)
+		return;
+
+	fdt_for_each_subnode(zone, blob, node) {
+		if (fdt_fixup_trips_node(blob, zone, maxc) < 0)
+			printf("Failed to set temperature in %s critical trips\n",
+			       fdt_get_name(blob, zone, NULL));
+	}
+}
+
 int ft_system_setup(void *blob, struct bd_info *bd)
 {
 	fdt_fixup_cores_nodes_am625(blob, k3_get_core_nr());
 	fdt_fixup_gpu_nodes_am625(blob, k3_has_gpu());
 	fdt_fixup_pru_node_am625(blob, k3_has_pru());
+	fdt_fixup_thermal_zone_nodes_am625(blob, k3_get_max_temp());
 
 	return 0;
 }